Antenna balun



FIG. 1 is a side elevational view of my new design for an antenna balun;

FIG. 2 is an end elevational view taken from the right or lefthand side of FIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof.

The non illustrated side of the antenna balun is the same as the illustrated side of FIG. 1. 

The ornamental design for an antenna balun, substantially as shown and described. 